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#include "screen.h"
#include "util/numtostr.h"
#include "util/strtonum.h"
static size_t tab_title_width(size_t tab_number, const char *filename)
{
return 3 + size_str_width(tab_number) + u_str_width(filename);
}
static void update_tab_title_width(View *view, size_t tab_number)
{
size_t w = tab_title_width(tab_number, buffer_filename(view->buffer));
view->tt_width = w;
view->tt_truncated_width = w;
}
static void update_first_tab_idx(Window *window)
{
size_t max_first_idx = window->views.count;
for (size_t w = 0; max_first_idx > 0; max_first_idx--) {
const View *view = window->views.ptrs[max_first_idx - 1];
w += view->tt_truncated_width;
if (w > window->w) {
break;
}
}
size_t min_first_idx = window->views.count;
for (size_t w = 0; min_first_idx > 0; min_first_idx--) {
const View *view = window->views.ptrs[min_first_idx - 1];
if (w || view == window->view) {
w += view->tt_truncated_width;
}
if (w > window->w) {
break;
}
}
size_t idx = CLAMP(window->first_tab_idx, min_first_idx, max_first_idx);
window->first_tab_idx = idx;
}
static void calculate_tabbar(Window *window)
{
int total_w = 0;
for (size_t i = 0, n = window->views.count; i < n; i++) {
View *view = window->views.ptrs[i];
if (view == window->view) {
// Make sure current tab is visible
window->first_tab_idx = MIN(i, window->first_tab_idx);
}
update_tab_title_width(view, i + 1);
total_w += view->tt_width;
}
if (total_w <= window->w) {
// All tabs fit without truncating
window->first_tab_idx = 0;
return;
}
// Truncate all wide tabs
total_w = 0;
int truncated_count = 0;
for (size_t i = 0, n = window->views.count; i < n; i++) {
View *view = window->views.ptrs[i];
int truncated_w = 20;
if (view->tt_width > truncated_w) {
view->tt_truncated_width = truncated_w;
total_w += truncated_w;
truncated_count++;
} else {
total_w += view->tt_width;
}
}
if (total_w > window->w) {
// Not all tabs fit even after truncating wide tabs
update_first_tab_idx(window);
return;
}
// All tabs fit after truncating wide tabs
int extra = window->w - total_w;
// Divide extra space between truncated tabs
while (extra > 0) {
BUG_ON(truncated_count == 0);
int extra_avg = extra / truncated_count;
int extra_mod = extra % truncated_count;
for (size_t i = 0, n = window->views.count; i < n; i++) {
View *view = window->views.ptrs[i];
int add = view->tt_width - view->tt_truncated_width;
if (add == 0) {
continue;
}
int avail = extra_avg;
if (extra_mod) {
// This is needed for equal divide
if (extra_avg == 0) {
avail++;
extra_mod--;
}
}
if (add > avail) {
add = avail;
} else {
truncated_count--;
}
view->tt_truncated_width += add;
extra -= add;
}
}
window->first_tab_idx = 0;
}
static void print_tab_title(Terminal *term, const ColorScheme *colors, const View *view, size_t idx)
{
const char *filename = buffer_filename(view->buffer);
int skip = view->tt_width - view->tt_truncated_width;
if (skip > 0) {
filename += u_skip_chars(filename, &skip);
}
const char *tab_number = uint_to_str((unsigned int)idx + 1);
TermOutputBuffer *obuf = &term->obuf;
bool is_active_tab = (view == view->window->view);
bool is_modified = buffer_modified(view->buffer);
bool left_overflow = (obuf->x == 0 && idx > 0);
set_builtin_color(term, colors, is_active_tab ? BC_ACTIVETAB : BC_INACTIVETAB);
term_put_char(obuf, left_overflow ? '<' : ' ');
term_add_str(obuf, tab_number);
term_put_char(obuf, is_modified ? '+' : ':');
term_add_str(obuf, filename);
size_t ntabs = view->window->views.count;
bool right_overflow = (obuf->x == (obuf->width - 1) && idx < (ntabs - 1));
term_put_char(obuf, right_overflow ? '>' : ' ');
}
void print_tabbar(Terminal *term, const ColorScheme *colors, Window *window)
{
TermOutputBuffer *obuf = &term->obuf;
term_output_reset(term, window->x, window->w, 0);
term_move_cursor(obuf, window->x, window->y);
calculate_tabbar(window);
size_t i = window->first_tab_idx;
size_t n = window->views.count;
for (; i < n; i++) {
const View *view = window->views.ptrs[i];
if (obuf->x + view->tt_truncated_width > window->w) {
break;
}
print_tab_title(term, colors, view, i);
}
set_builtin_color(term, colors, BC_TABBAR);
if (i == n) {
term_clear_eol(term);
return;
}
while (obuf->x < obuf->width - 1) {
term_put_char(obuf, ' ');
}
if (obuf->x == obuf->width - 1) {
term_put_char(obuf, '>');
}
}
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